You're not the only one who doesn't recognize celebrities!
GV, years ago I was in San Antonio, Texas, for a medical school interview. After my wife and I checked into our fifth floor room in the hotel, I went down to the lobby to get a newspaper. When I stepped into the elevator for the trip down, there was a distinguished, somewhat portly man in it. We said "Hello" to each other and then turned our thoughts inward, as all elevator riders do, for the ride down to the lobby. I, however, thought to myself that this guy really, really looks familiar. I was convinced that I'd seen him before but couldn't place him. When the elevator reached the lobby and its door opened, there was a very attractive blonde waiting for the guy. "Hello, Peter," she said and they then walked off arm-in-arm. The bell went off in my head. Of course, "Peter" was Peter Ustinov! We'd read that "Viva Zapata" was being filmed in San Antonio. Our hotel was the base of operations for the actors, actresses and film crew.